Step 1: Preheat and Prepare
Preheat your oven to 400°F (200°C). Line a large baking sheet with aluminum foil or parchment paper for easy cleanup. Set aside.

Step 2: Slice the Bread
Using a sharp bread knife, carefully slice the bread loaf in half lengthwise, creating two long halves. Place both halves cut-side up on the prepared baking sheet.

Step 3: Make the Garlic Butter
In a small mixing bowl, combine the softened butter, minced garlic, chopped parsley, salt, black pepper, and Italian seasoning if using. Mix thoroughly with a fork until all ingredients are evenly incorporated and the mixture is creamy and spreadable.

Step 4: Spread the Garlic Butter
Generously spread the garlic butter mixture over the cut side of both bread halves, making sure to cover the entire surface edge to edge. Don’t be shy with the butter – this is what makes the bread incredibly flavorful and prevents it from drying out.

Step 5: First Bake (Toast the Bread)
Place the bread in the preheated oven and bake for 5-7 minutes, just until the edges start to turn golden and the butter has melted into the bread. This pre-toasting step ensures you get a crispy base that won’t become soggy under the cheese.

Step 6: Add the Cheese
Remove the bread from the oven. Sprinkle the shredded mozzarella cheese evenly over both halves, followed by the grated Parmesan cheese. Make sure to distribute the cheese all the way to the edges for maximum cheesy coverage.

Step 7: Final Bake
Return the bread to the oven and bake for an additional 7-8 minutes, or until the cheese is fully melted, bubbling, and starting to turn golden brown in spots. For extra-crispy, browned cheese, you can turn on the broiler for the last 1-2 minutes, but watch it closely to prevent burning.

Step 8: Garnish and Serve
Remove from the oven and immediately sprinkle with additional fresh parsley and a pinch of red pepper flakes if desired. Let cool for 2-3 minutes (just enough so you don’t burn your mouth!), then slice into individual portions and serve hot.